Re: LED grams per watt

Originally Posted by lenngray

You're alluding to the replacement costs of an HPS bulb?
Even if I decided to replace the bulb every 6 months as some have implied was necessary, I just looked up a replacement for my 55,000 lumen 400W as $20.88 shipped, so you're talking about the 9 x that, to be added to the cost? What's the cost of fraud. And which manufacturers' lights are going to match the yield of the HPS? And who's gonna guarantee that we got the right one, if everybody is willing to testify to the lies?

initial cost of lights and fixtures
bulbs
cost of electricity
aditional cost of ducts and fans plus the electricity
Almost double water for HPS

"Why use up the forests which were centuries in the making and the mines which required ages to lay down, if we can get the equivalent of forest and mineral products in the annual growth of the hemp fields?" - Henry Ford

Re: LED grams per watt

Originally Posted by lenngray

You're alluding to the replacement costs of an HPS bulb?
Even if I decided to replace the bulb every 6 months as some have implied was necessary, I just looked up a replacement for my 55,000 lumen 400W as $20.88 shipped, so you're talking about the 9 x that, to be added to the cost? What's the cost of fraud. And which manufacturers' lights are going to match the yield of the HPS? And who's gonna guarantee that we got the right one, if everybody is willing to testify to the lies?

I thought we were talking about 1000 watt bulbs ... try $70.00-100.00 x 9 I just looked up a nice Hortilux HX66785 1000-Watt Super HPS Spectrum Grow Bulb and found it at a mere 72 bucks

"Why use up the forests which were centuries in the making and the mines which required ages to lay down, if we can get the equivalent of forest and mineral products in the annual growth of the hemp fields?" - Henry Ford

Re: LED grams per watt

I am pretty sure the only way one could acquire 2G a watt from LED's would be if they use a light mover bar and did a fast double harvest / harvest the top buds lower the lights and mature the bottom scrag.
I have Just bought my first LED lights and am currently starting a 5 plant grow in a 2x4x6 plywood grow box. pics to come at some point after the cute seedling stage.

Re: LED grams per watt

Back to the main question of what HID and LED growers are getting in yield... Here are my results from all my grows.

The grows were all in the exact same growtent (a 2x4 hydrohut silver that measures 2.5'x5'x7'). Each grow featured 6 plants of various strains so a direct comparison is not really accurate, but more of a "trend" is visible with HID vs LED. Between each grow the soil has had minor changes as well as nutrients so again, this can not be used as a "scientific" comparison, however I do notice a trend of a equal or higher Gram/watt with LED vs HID...however yields are slightly lower under LED vs HID... if given equal draw wattage I think LED would have the edge...

Re: LED grams per watt

Originally Posted by theengineer

my gpw went from circa 56 with HPS to circa 85 with LED - there is no question that LED can now exceed HID in this metric imo

nice , that's a 50% increase in the gr per watt , I hope to realize a 50% improvement in gpw's with my first led harvest. ( time will tell ) I will be using about 500w from two 432w panels for flowering.

Re: LED grams per watt

Re: LED grams per watt

No , Some plain 144 x3w panels , black in color , oddly made or marketed by UFO.
I won them on a auction 2 for $170 ( what a deal) I had bought a MarsHydro 300w old style panel a few weeks earlier , its on the seedlings now , it will be used for the "grow" light , the two larger LED's will be put to service in the 2x4x6 plywood cabinet for flowering while the first grow led starts a new batch.

Re: LED grams per watt

The most important metric at this point, with LED users getting good outcomes, is the reduced power consumption which naturally corresponds to a reduced carbon foot print. With this taken into consideration I find it irresponsible to continue the use of MH/HPS setups unless there is some byproduct that I am aware of.

If you look at Earth from space you see a dot, that's here. That's home. That's us. It underscores the responsibility to deal more kindly and compassionately with one another and to preserve and cherish that pale blue dot, the only home we've ever known.
- Carl Sagan -